I'll throw my Pro into the ring as I think with all the mods I've put into in, it puts it into more of a Promium class pin.

In no real particular order since I love them all.

Aurich's trans/decals+Refinery custom interactive LED backboard
Zitt's pop caps
Warp Ramp Chase Lights
Klingon Ship
Vengeance Explosion mod
Vengeance visor/interactive led mod
Hallmark lighted Enterprise ship
Erak's Asteroid(5-piece set) mod
Mirror blades
LED flipper buttons
LED speaker kit
Cliffy protectors
Freddy's ramp protectors
Superbands everywhere
Invisiglass

I think that's everything. I've wanted to do a few more like the Refinery apron. I'll definitely be getting a ColorDMD if/when it comes out. I also wish that there was a way to make a laser mod for the Pros. That would be wicked cool. This is definitely my hot rod.